Monthly Archives: October 2016

Job Offers: Two open positions for Electro-optical Engineers at VioBio Lab

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Positions for Electro-optical Engineers (one expert in Software and Firmware automation of opto-electronic and opto-mechanic elements in laboratory set-ups and one expert in setting-up of biomedical systems through opto-electronic instruments) are open at VIOBIO Lab, with immediate availability, in the context of regional funding for supporting laboratories and research centres in the Region of Madrid.

See full profiles and contact details in the corresponding job offers:

Electro-optical Engineer post-1

Electro-optical Engineer post-2

 

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VioBio Lab at Frontiers in Optics 2016, Optical Society, Rochester NY

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VioBio Lab Members have participated extensively at the OSA Frontiers in Optics 2016, which has showcasted an excellent scientific program as well as extraordinary OSA centennial celebrations.

The following papers were presented at the scientific program:

Vyas Akondi, Carlos Dorronsoro, Enrique Gambra, Maria Vinas, Daniel Pascual, Sara Aissati, Susana Marcos; Temporal multiplexing and simulation of multifocal intraocular lenses. Contributed oral in “Novel Design Concepts for Eye Correction and Vision Simulators I” sesión

Andres De La Hoz, Eduardo Martinez-Enriquez, Carlos Dorronsoro, Nandor Bekesi, Nicolas Alejandre, Hrebesh Subhash , Daniel Pascual, Susana Marcos; Surface-changing Accommodating Intraocular Lens for Presbyopia Correction. Contributed oral in “Novel Design Concepts for Eye Correction and Vision Simulators II” sesión

Carlos Dorronsoro, Aiswaryah Radhakrishnan1, Jose Ramon Alonso-Sanz, Daniel Pascual, Enrique Gambra, Vyas Akondi, Susana Marcos;  SimVis: See-through Simulation of Presbyopic Corrections. Contributed oral in “Novel Design Concepts for Eye Correction and Vision Simulators II”

Susana Marcos, Pablo Perez-Merino, Miriam Velasco-Ocana1, Eduardo Martinez- Enriquez, Luis Revuelta, Sally A. McFadden; Changes in anterior segment 3-D geometry in normal and myopic guinea pig eye. Contributed oral in “Understanding  Myopia Development”

In Addition:

Susana Marcos was a panelist at the Global Women of Light Symposium, WISTII, in the panel presider.

Andres de la Hoz, President of the IOSA Student Chapter attended the Student leadership Conference.

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At the OSA Editor’s reception on 17th October, Vyas Akondi was recognized as 2016 OSA Outstanding Reviewer.

Representing the Optical metrology Technical Group as a committee member, Vyas Akondi attended the 2016 Technical Group Leadership Meeting on 17th October.

Presider of a technical session titled: Novel Design Concepts for Eye Correction and Vision Simulators II on 19th October.

Oral presentation by Vyas Akondi on 19th October – Title of the talk – “Temporal multiplexing and simulation of multifocal intraocular lenses”, Authors: Vyas Akondi, Carlos Dorronsoro, Enrique Gambra, Maria Vinas, Daniel Pascual, Sara Aissati, and Susana Marcos, Frontiers in Optics 2016, OSA Technical Digest (online) (Optical Society of America, 2016), paper FW2A.3. https://www.osapublishing.org/abstract.cfm?uri=FiO-2016-FW2A.3

Susana Marcos chaired the Vision and Color Subcommittee, organizing 5 sessions and one symposium, presided the Symposium on 100 Years of Vision at OSA: Most cited vision papers in OSA journals
Susana Marcos presented at the Plenary session as elected Frontiers in Optics 2017 Co-chair
Carlos Dorronsoro, Vyas  Akondi and Susana Marcos attended the OSA Fall Vision Meeting
And of course attended the amazing centennial celebration events held during the week. A productive and memorable conference!

Noise robust phase unwrapping with a virtual pyramid

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Now, it is possible to effectively unwrap phase with noisy and low-signal interferometric measurements with the new method of phase unwrapping called the virtual pyramid wavefront sensor. This was demonstrated while reconstructing wavefronts from interferograms obtained in a digital (SLM-based) phase-shifting point diffraction interferometer. In comparison with existing methods, this new phase unwrapping method was found to be robust to random noise. We believe that this method can be applied to several metrology applications in ophthalmology, magnetic elastography and astronomy.

Full Citation: Vyas Akondi, Brian Vohnsen, and Susana Marcos, “Virtual pyramid wavefront sensor for phase unwrapping,” Applied Optics 55(29), 8363-8367 (2016).

Full Article: https://www.osapublishing.org/ao/fulltext.cfm?uri=ao-55-29-8363&id=350986

 

Reconstructing full crystalline lens shape in vivo using OCT imaging, published in IOVS

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We developed a methodology to reconstruct the entire crystalline lens shape, beyond the area visible through the pupil. The method uses data from ex vivo crystalline lenses to develop, test and validate the model. The accuracy in the estimation of lens volume, lens diameter or the equatorial lens position exceeds that achieved by state-of-the art methods. The method was applied in vivo in accommodating and cataract eyes. The paper is published in IOVS (Special issue commemorating 25 years of OCT)

Full reference: Martinez-Enriquez E, Sun M, Velasco-Ocana M, Birkenfeld J, P´erez-Merino P, Marcos S. Optical coherence tomography based estimates of crystalline
lens volume, equatorial diameter,and plane position. InvestOphthalmol Vis Sci. 2016;57:OCT600–OCT610.

 

New in the lab: Xoana Barcala

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We welcome Xoana Barcala who will be joining VioBio to work on her Master Thesis work. Xoana is a Masters Student of the Vision Science Interuniversity Program led by the University of Valladolid, who has led BSc. studies in optometry and vision science at the Universidad Complutense de Madrid and Univesity of Latvia. Her interests reside in adaptive optics and temporal multiplexing approaches to simultaneous vision simulation.

 

New in the lab: Neeraj Kumar Singh

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We welcome Neeraj Kumar, joining VioBio Lab today as a Early Career Research Fellow in MyFun Marie Curie ITN.  Neeraj comes to us from the Schepens Eye Research Institute-MEEI, Harvard University, where he has trained with Prof. Eli Peli, following Vision Science and Optometry Studies at the Elite Schol of Optometry in Chenai, India.
He joins other 13 young scientists in an international,  at the interface of physics and biology, to study unresolved questions about the visual control of eye growth as part of the MyFun ITN Network.
More information on MyFun ITN network can be found in: http://www.itn-myfun.eu/

New in the lab: Geethika Muralidharan

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We welcome Geethika Muralidharan, joining VioBio Lab today as a Early Career Research Fellow in MyFun Marie Curie Sklowdoska  ITN.  Geethika, a MSc in Physics, comes to us from Cochin University of Science and Technology, in India, with a specialty in Photonics.
She joins other 13 young scientists in an international,  at the interface of physics and biology, to study unresolved questions about the visual control of eye growth as part of the MyFun ITN Network.
More information on MyFun ITN network can be found in: http://www.itn-myfun.eu/

 

Visual perception with different bifocal designs simulated with a 2-channel SimVis, published in Biomedical Optics Express

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A 2-channel Simultaneous Vision Simulator provided with a spatial light modulator was used to generate 14 bifocal patterns (concentric, angularly segmented and hybrid). Patients performed perceived visual scoring, pattern preference and visual acuity tests at near, intermediate and far with the simulated lenses. Angularly segmented designs tended to outperfom the rest of designs on average. However, the high intersubject difference in preference and performance suggests patient specific interactions of the eye’s optics and the lens, and perceptual factors, which should be considered for bifocal design selection. Simultaneous Vision Simulators are excellent tools to identify the optimal correction for a patient, taking into account these factors.  The study has been published yesterday in Biomedical Optics Express.
Carlos Dorronsoro, Aiswaryah Radhakrishnan, Pablo de Gracia, Lucie Sawides, and Susana Marcos, “Perceived image quality with simulated segmented bifocal corrections,” Biomed. Opt. Express 7, 4388-4399 (2016).

LINKhttps://www.osapublishing.org/boe/fulltext.cfm?uri=boe-7-11-4388&id=350860

 

Effect of orientation of a rotationally asymmetric bifocal lens design on visual quality using SimVis, published in JCRS

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We used a two-channel Simultaneous Vision Simulator provided with a spatial light simulator to simulate the impact of the orientation of an angularly segmented bifocal lens design on vision. The lens represents a commercially-available design (Oculentis Mplus), but texperiments can be performed on the same eye (i.e. not involving IOL implant, and making it possible to compare across 8 different rotation positions).  We found that the bias towards particular orientations in some individuals could be explained by the interactions of the optics of the eye with the lens design. The paper appears in the current issue of the Journal of Cataract and Refractive Surgery

Full reference: Radhakrishnan, Dorronsoro and Marcos. Differences in visual quality with orientation of a rotationally asymmetric bifocal intraocular lens design Journal of Cataract & Refractive Surgery 42 (9) 1276–1287 (2016)
Link: http://www.sciencedirect.com/science/article/pii/S0886335016303078

IBE.TV interview to Susana Marcos in “El Arbol de la Ciencia”

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El Arbol de la Ciencia, a program of ibe.tv, a plaform for education, culture, science and cooperation in iberoamerica, interviews Susana Marcos, in a series of program dedicated to Women Scientists.  Susana Marcos talks about aspects about her life and career.

You can watch the interview in this link: http://www.ibe.tv/es/canal/ciencia/894/Susana-Marcos-hay-diferencias-de-género-particularmente-en-f%C3%ADsica.htm

 

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